include/linux/sched.h

   1 #ifndef _LINUX_SCHED_H
   2 #define _LINUX_SCHED_H
   3
   4 /*
   5  * cloning flags:
   6  */
   7 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
   8 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
   9 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  10 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  11 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  12 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  13 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  14 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  15 #define CLONE_THREAD    0x00010000      /* Same thread group? */
  16 #define CLONE_NEWNS     0x00020000      /* New namespace group? */
  17 #define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
  18 #define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
  19 #define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
  20 #define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
  21 #define CLONE_DETACHED          0x00400000      /* Unused, ignored */
  22 #define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
  23 #define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
  24 #define CLONE_STOPPED           0x02000000      /* Start in stopped state */
  25 #define CLONE_NEWUTS            0x04000000      /* New utsname group? */
  26 #define CLONE_NEWIPC            0x08000000      /* New ipcs */
  27 #define CLONE_NEWUSER           0x10000000      /* New user namespace */
  28 #define CLONE_NEWPID            0x20000000      /* New pid namespace */
  29 #define CLONE_NEWNET            0x40000000      /* New network namespace */
  30 #define CLONE_IO                0x80000000      /* Clone io context */
  31
  32 /*
  33  * Scheduling policies
  34  */
  35 #define SCHED_NORMAL            0
  36 #define SCHED_FIFO              1
  37 #define SCHED_RR                2
  38 #define SCHED_BATCH             3
  39 /* SCHED_ISO: reserved but not implemented yet */
  40 #define SCHED_IDLE              5
  41
  42 #ifdef __KERNEL__
  43
  44 struct sched_param {
  45         int sched_priority;
  46 };
  47
  48 #include <asm/param.h>  /* for HZ */
  49
  50 #include <linux/capability.h>
  51 #include <linux/threads.h>
  52 #include <linux/kernel.h>
  53 #include <linux/types.h>
  54 #include <linux/timex.h>
  55 #include <linux/jiffies.h>
  56 #include <linux/rbtree.h>
  57 #include <linux/thread_info.h>
  58 #include <linux/cpumask.h>
  59 #include <linux/errno.h>
  60 #include <linux/nodemask.h>
  61 #include <linux/mm_types.h>
  62
  63 #include <asm/system.h>
  64 #include <asm/page.h>
  65 #include <asm/ptrace.h>
  66 #include <asm/cputime.h>
  67
  68 #include <linux/smp.h>
  69 #include <linux/sem.h>
  70 #include <linux/signal.h>
  71 #include <linux/fs_struct.h>
  72 #include <linux/compiler.h>
  73 #include <linux/completion.h>
  74 #include <linux/pid.h>
  75 #include <linux/percpu.h>
  76 #include <linux/topology.h>
  77 #include <linux/proportions.h>
  78 #include <linux/seccomp.h>
  79 #include <linux/rcupdate.h>
  80 #include <linux/rtmutex.h>
  81
  82 #include <linux/time.h>
  83 #include <linux/param.h>
  84 #include <linux/resource.h>
  85 #include <linux/timer.h>
  86 #include <linux/hrtimer.h>
  87 #include <linux/task_io_accounting.h>
  88 #include <linux/kobject.h>
  89 #include <linux/latencytop.h>
  90
  91 #include <asm/processor.h>
  92
  93 struct mem_cgroup;
  94 struct exec_domain;
  95 struct futex_pi_state;
  96 struct robust_list_head;
  97 struct bio;
  98
  99 /*
 100  * List of flags we want to share for kernel threads,
 101  * if only because they are not used by them anyway.
 102  */
 103 #define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
 104
 105 /*
 106  * These are the constant used to fake the fixed-point load-average
 107  * counting. Some notes:
 108  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 109  *    a load-average precision of 10 bits integer + 11 bits fractional
 110  *  - if you want to count load-averages more often, you need more
 111  *    precision, or rounding will get you. With 2-second counting freq,
 112  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 113  *    11 bit fractions.
 114  */
 115 extern unsigned long avenrun[];         /* Load averages */
 116
 117 #define FSHIFT          11              /* nr of bits of precision */
 118 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
 119 #define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
 120 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
 121 #define EXP_5           2014            /* 1/exp(5sec/5min) */
 122 #define EXP_15          2037            /* 1/exp(5sec/15min) */
 123
 124 #define CALC_LOAD(load,exp,n) \
 125         load *= exp; \
 126         load += n*(FIXED_1-exp); \
 127         load >>= FSHIFT;
 128
 129 extern unsigned long total_forks;
 130 extern int nr_threads;
 131 DECLARE_PER_CPU(unsigned long, process_counts);
 132 extern int nr_processes(void);
 133 extern unsigned long nr_running(void);
 134 extern unsigned long nr_uninterruptible(void);
 135 extern unsigned long nr_active(void);
 136 extern unsigned long nr_iowait(void);
 137 extern unsigned long weighted_cpuload(const int cpu);
 138
 139 struct seq_file;
 140 struct cfs_rq;
 141 struct task_group;
 142 #ifdef CONFIG_SCHED_DEBUG
 143 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 144 extern void proc_sched_set_task(struct task_struct *p);
 145 extern void
 146 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 147 #else
 148 static inline void
 149 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 150 {
 151 }
 152 static inline void proc_sched_set_task(struct task_struct *p)
 153 {
 154 }
 155 static inline void
 156 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 157 {
 158 }
 159 #endif
 160
 161 extern unsigned long long time_sync_thresh;
 162
 163 /*
 164  * Task state bitmask. NOTE! These bits are also
 165  * encoded in fs/proc/array.c: get_task_state().
 166  *
 167  * We have two separate sets of flags: task->state
 168  * is about runnability, while task->exit_state are
 169  * about the task exiting. Confusing, but this way
 170  * modifying one set can't modify the other one by
 171  * mistake.
 172  */
 173 #define TASK_RUNNING            0
 174 #define TASK_INTERRUPTIBLE      1
 175 #define TASK_UNINTERRUPTIBLE    2
 176 #define __TASK_STOPPED          4
 177 #define __TASK_TRACED           8
 178 /* in tsk->exit_state */
 179 #define EXIT_ZOMBIE             16
 180 #define EXIT_DEAD               32
 181 /* in tsk->state again */
 182 #define TASK_DEAD               64
 183 #define TASK_WAKEKILL           128
 184
 185 /* Convenience macros for the sake of set_task_state */
 186 #define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 187 #define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
 188 #define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
 189
 190 /* Convenience macros for the sake of wake_up */
 191 #define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 192 #define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 193
 194 /* get_task_state() */
 195 #define TASK_REPORT             (TASK_RUNNING | TASK_INTERRUPTIBLE | \
 196                                  TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 197                                  __TASK_TRACED)
 198
 199 #define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
 200 #define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
 201 #define task_is_stopped_or_traced(task) \
 202                         ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 203 #define task_contributes_to_load(task)  \
 204                                 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
 205
 206 #define __set_task_state(tsk, state_value)              \
 207         do { (tsk)->state = (state_value); } while (0)
 208 #define set_task_state(tsk, state_value)                \
 209         set_mb((tsk)->state, (state_value))
 210
 211 /*
 212  * set_current_state() includes a barrier so that the write of current->state
 213  * is correctly serialised wrt the caller's subsequent test of whether to
 214  * actually sleep:
 215  *
 216  *      set_current_state(TASK_UNINTERRUPTIBLE);
 217  *      if (do_i_need_to_sleep())
 218  *              schedule();
 219  *
 220  * If the caller does not need such serialisation then use __set_current_state()
 221  */
 222 #define __set_current_state(state_value)                        \
 223         do { current->state = (state_value); } while (0)
 224 #define set_current_state(state_value)          \
 225         set_mb(current->state, (state_value))
 226
 227 /* Task command name length */
 228 #define TASK_COMM_LEN 16
 229
 230 #include <linux/spinlock.h>
 231
 232 /*
 233  * This serializes "schedule()" and also protects
 234  * the run-queue from deletions/modifications (but
 235  * _adding_ to the beginning of the run-queue has
 236  * a separate lock).
 237  */
 238 extern rwlock_t tasklist_lock;
 239 extern spinlock_t mmlist_lock;
 240
 241 struct task_struct;
 242
 243 extern void sched_init(void);
 244 extern void sched_init_smp(void);
 245 extern asmlinkage void schedule_tail(struct task_struct *prev);
 246 extern void init_idle(struct task_struct *idle, int cpu);
 247 extern void init_idle_bootup_task(struct task_struct *idle);
 248
 249 extern cpumask_t nohz_cpu_mask;
 250 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 251 extern int select_nohz_load_balancer(int cpu);
 252 #else
 253 static inline int select_nohz_load_balancer(int cpu)
 254 {
 255         return 0;
 256 }
 257 #endif
 258
 259 extern unsigned long rt_needs_cpu(int cpu);
 260
 261 /*
 262  * Only dump TASK_* tasks. (0 for all tasks)
 263  */
 264 extern void show_state_filter(unsigned long state_filter);
 265
 266 static inline void show_state(void)
 267 {
 268         show_state_filter(0);
 269 }
 270
 271 extern void show_regs(struct pt_regs *);
 272
 273 /*
 274  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 275  * task), SP is the stack pointer of the first frame that should be shown in the back
 276  * trace (or NULL if the entire call-chain of the task should be shown).
 277  */
 278 extern void show_stack(struct task_struct *task, unsigned long *sp);
 279
 280 void io_schedule(void);
 281 long io_schedule_timeout(long timeout);
 282
 283 extern void cpu_init (void);
 284 extern void trap_init(void);
 285 extern void account_process_tick(struct task_struct *task, int user);
 286 extern void update_process_times(int user);
 287 extern void scheduler_tick(void);
 288 extern void hrtick_resched(void);
 289
 290 extern void sched_show_task(struct task_struct *p);
 291
 292 #ifdef CONFIG_DETECT_SOFTLOCKUP
 293 extern void softlockup_tick(void);
 294 extern void spawn_softlockup_task(void);
 295 extern void touch_softlockup_watchdog(void);
 296 extern void touch_all_softlockup_watchdogs(void);
 297 extern unsigned long  softlockup_thresh;
 298 extern unsigned long sysctl_hung_task_check_count;
 299 extern unsigned long sysctl_hung_task_timeout_secs;
 300 extern unsigned long sysctl_hung_task_warnings;
 301 #else
 302 static inline void softlockup_tick(void)
 303 {
 304 }
 305 static inline void spawn_softlockup_task(void)
 306 {
 307 }
 308 static inline void touch_softlockup_watchdog(void)
 309 {
 310 }
 311 static inline void touch_all_softlockup_watchdogs(void)
 312 {
 313 }
 314 #endif
 315
 316
 317 /* Attach to any functions which should be ignored in wchan output. */
 318 #define __sched         __attribute__((__section__(".sched.text")))
 319
 320 /* Linker adds these: start and end of __sched functions */
 321 extern char __sched_text_start[], __sched_text_end[];
 322
 323 /* Is this address in the __sched functions? */
 324 extern int in_sched_functions(unsigned long addr);
 325
 326 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 327 extern signed long schedule_timeout(signed long timeout);
 328 extern signed long schedule_timeout_interruptible(signed long timeout);
 329 extern signed long schedule_timeout_killable(signed long timeout);
 330 extern signed long schedule_timeout_uninterruptible(signed long timeout);
 331 asmlinkage void schedule(void);
 332
 333 struct nsproxy;
 334 struct user_namespace;
 335
 336 /* Maximum number of active map areas.. This is a random (large) number */
 337 #define DEFAULT_MAX_MAP_COUNT   65536
 338
 339 extern int sysctl_max_map_count;
 340
 341 #include <linux/aio.h>
 342
 343 extern unsigned long
 344 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 345                        unsigned long, unsigned long);
 346 extern unsigned long
 347 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 348                           unsigned long len, unsigned long pgoff,
 349                           unsigned long flags);
 350 extern void arch_unmap_area(struct mm_struct *, unsigned long);
 351 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 352
 353 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 354 /*
 355  * The mm counters are not protected by its page_table_lock,
 356  * so must be incremented atomically.
 357  */
 358 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
 359 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
 360 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
 361 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
 362 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
 363
 364 #else  /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 365 /*
 366  * The mm counters are protected by its page_table_lock,
 367  * so can be incremented directly.
 368  */
 369 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
 370 #define get_mm_counter(mm, member) ((mm)->_##member)
 371 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
 372 #define inc_mm_counter(mm, member) (mm)->_##member++
 373 #define dec_mm_counter(mm, member) (mm)->_##member--
 374
 375 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 376
 377 #define get_mm_rss(mm)                                  \
 378         (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
 379 #define update_hiwater_rss(mm)  do {                    \
 380         unsigned long _rss = get_mm_rss(mm);            \
 381         if ((mm)->hiwater_rss < _rss)                   \
 382                 (mm)->hiwater_rss = _rss;               \
 383 } while (0)
 384 #define update_hiwater_vm(mm)   do {                    \
 385         if ((mm)->hiwater_vm < (mm)->total_vm)          \
 386                 (mm)->hiwater_vm = (mm)->total_vm;      \
 387 } while (0)
 388
 389 extern void set_dumpable(struct mm_struct *mm, int value);
 390 extern int get_dumpable(struct mm_struct *mm);
 391
 392 /* mm flags */
 393 /* dumpable bits */
 394 #define MMF_DUMPABLE      0  /* core dump is permitted */
 395 #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 396 #define MMF_DUMPABLE_BITS 2
 397
 398 /* coredump filter bits */
 399 #define MMF_DUMP_ANON_PRIVATE   2
 400 #define MMF_DUMP_ANON_SHARED    3
 401 #define MMF_DUMP_MAPPED_PRIVATE 4
 402 #define MMF_DUMP_MAPPED_SHARED  5
 403 #define MMF_DUMP_ELF_HEADERS    6
 404 #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 405 #define MMF_DUMP_FILTER_BITS    5
 406 #define MMF_DUMP_FILTER_MASK \
 407         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 408 #define MMF_DUMP_FILTER_DEFAULT \
 409         ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
 410
 411 struct sighand_struct {
 412         atomic_t                count;
 413         struct k_sigaction      action[_NSIG];
 414         spinlock_t              siglock;
 415         wait_queue_head_t       signalfd_wqh;
 416 };
 417
 418 struct pacct_struct {
 419         int                     ac_flag;
 420         long                    ac_exitcode;
 421         unsigned long           ac_mem;
 422         cputime_t               ac_utime, ac_stime;
 423         unsigned long           ac_minflt, ac_majflt;
 424 };
 425
 426 /*
 427  * NOTE! "signal_struct" does not have it's own
 428  * locking, because a shared signal_struct always
 429  * implies a shared sighand_struct, so locking
 430  * sighand_struct is always a proper superset of
 431  * the locking of signal_struct.
 432  */
 433 struct signal_struct {
 434         atomic_t                count;
 435         atomic_t                live;
 436
 437         wait_queue_head_t       wait_chldexit;  /* for wait4() */
 438
 439         /* current thread group signal load-balancing target: */
 440         struct task_struct      *curr_target;
 441
 442         /* shared signal handling: */
 443         struct sigpending       shared_pending;
 444
 445         /* thread group exit support */
 446         int                     group_exit_code;
 447         /* overloaded:
 448          * - notify group_exit_task when ->count is equal to notify_count
 449          * - everyone except group_exit_task is stopped during signal delivery
 450          *   of fatal signals, group_exit_task processes the signal.
 451          */
 452         struct task_struct      *group_exit_task;
 453         int                     notify_count;
 454
 455         /* thread group stop support, overloads group_exit_code too */
 456         int                     group_stop_count;
 457         unsigned int            flags; /* see SIGNAL_* flags below */
 458
 459         /* POSIX.1b Interval Timers */
 460         struct list_head posix_timers;
 461
 462         /* ITIMER_REAL timer for the process */
 463         struct hrtimer real_timer;
 464         struct pid *leader_pid;
 465         ktime_t it_real_incr;
 466
 467         /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
 468         cputime_t it_prof_expires, it_virt_expires;
 469         cputime_t it_prof_incr, it_virt_incr;
 470
 471         /* job control IDs */
 472
 473         /*
 474          * pgrp and session fields are deprecated.
 475          * use the task_session_Xnr and task_pgrp_Xnr routines below
 476          */
 477
 478         union {
 479                 pid_t pgrp __deprecated;
 480                 pid_t __pgrp;
 481         };
 482
 483         struct pid *tty_old_pgrp;
 484
 485         union {
 486                 pid_t session __deprecated;
 487                 pid_t __session;
 488         };
 489
 490         /* boolean value for session group leader */
 491         int leader;
 492
 493         struct tty_struct *tty; /* NULL if no tty */
 494
 495         /*
 496          * Cumulative resource counters for dead threads in the group,
 497          * and for reaped dead child processes forked by this group.
 498          * Live threads maintain their own counters and add to these
 499          * in __exit_signal, except for the group leader.
 500          */
 501         cputime_t utime, stime, cutime, cstime;
 502         cputime_t gtime;
 503         cputime_t cgtime;
 504         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 505         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 506         unsigned long inblock, oublock, cinblock, coublock;
 507
 508         /*
 509          * Cumulative ns of scheduled CPU time for dead threads in the
 510          * group, not including a zombie group leader.  (This only differs
 511          * from jiffies_to_ns(utime + stime) if sched_clock uses something
 512          * other than jiffies.)
 513          */
 514         unsigned long long sum_sched_runtime;
 515
 516         /*
 517          * We don't bother to synchronize most readers of this at all,
 518          * because there is no reader checking a limit that actually needs
 519          * to get both rlim_cur and rlim_max atomically, and either one
 520          * alone is a single word that can safely be read normally.
 521          * getrlimit/setrlimit use task_lock(current->group_leader) to
 522          * protect this instead of the siglock, because they really
 523          * have no need to disable irqs.
 524          */
 525         struct rlimit rlim[RLIM_NLIMITS];
 526
 527         struct list_head cpu_timers[3];
 528
 529         /* keep the process-shared keyrings here so that they do the right
 530          * thing in threads created with CLONE_THREAD */
 531 #ifdef CONFIG_KEYS
 532         struct key *session_keyring;    /* keyring inherited over fork */
 533         struct key *process_keyring;    /* keyring private to this process */
 534 #endif
 535 #ifdef CONFIG_BSD_PROCESS_ACCT
 536         struct pacct_struct pacct;      /* per-process accounting information */
 537 #endif
 538 #ifdef CONFIG_TASKSTATS
 539         struct taskstats *stats;
 540 #endif
 541 #ifdef CONFIG_AUDIT
 542         unsigned audit_tty;
 543         struct tty_audit_buf *tty_audit_buf;
 544 #endif
 545 };
 546
 547 /* Context switch must be unlocked if interrupts are to be enabled */
 548 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 549 # define __ARCH_WANT_UNLOCKED_CTXSW
 550 #endif
 551
 552 /*
 553  * Bits in flags field of signal_struct.
 554  */
 555 #define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 556 #define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 557 #define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 558 #define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 559 /*
 560  * Pending notifications to parent.
 561  */
 562 #define SIGNAL_CLD_STOPPED      0x00000010
 563 #define SIGNAL_CLD_CONTINUED    0x00000020
 564 #define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 565
 566 #define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
 567
 568 /* If true, all threads except ->group_exit_task have pending SIGKILL */
 569 static inline int signal_group_exit(const struct signal_struct *sig)
 570 {
 571         return  (sig->flags & SIGNAL_GROUP_EXIT) ||
 572                 (sig->group_exit_task != NULL);
 573 }
 574
 575 /*
 576  * Some day this will be a full-fledged user tracking system..
 577  */
 578 struct user_struct {
 579         atomic_t __count;       /* reference count */
 580         atomic_t processes;     /* How many processes does this user have? */
 581         atomic_t files;         /* How many open files does this user have? */
 582         atomic_t sigpending;    /* How many pending signals does this user have? */
 583 #ifdef CONFIG_INOTIFY_USER
 584         atomic_t inotify_watches; /* How many inotify watches does this user have? */
 585         atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 586 #endif
 587 #ifdef CONFIG_POSIX_MQUEUE
 588         /* protected by mq_lock */
 589         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 590 #endif
 591         unsigned long locked_shm; /* How many pages of mlocked shm ? */
 592
 593 #ifdef CONFIG_KEYS
 594         struct key *uid_keyring;        /* UID specific keyring */
 595         struct key *session_keyring;    /* UID's default session keyring */
 596 #endif
 597
 598         /* Hash table maintenance information */
 599         struct hlist_node uidhash_node;
 600         uid_t uid;
 601
 602 #ifdef CONFIG_USER_SCHED
 603         struct task_group *tg;
 604 #ifdef CONFIG_SYSFS
 605         struct kobject kobj;
 606         struct work_struct work;
 607 #endif
 608 #endif
 609 };
 610
 611 extern int uids_sysfs_init(void);
 612
 613 extern struct user_struct *find_user(uid_t);
 614
 615 extern struct user_struct root_user;
 616 #define INIT_USER (&root_user)
 617
 618 struct backing_dev_info;
 619 struct reclaim_state;
 620
 621 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 622 struct sched_info {
 623         /* cumulative counters */
 624         unsigned long pcount;         /* # of times run on this cpu */
 625         unsigned long long cpu_time,  /* time spent on the cpu */
 626                            run_delay; /* time spent waiting on a runqueue */
 627
 628         /* timestamps */
 629         unsigned long long last_arrival,/* when we last ran on a cpu */
 630                            last_queued; /* when we were last queued to run */
 631 #ifdef CONFIG_SCHEDSTATS
 632         /* BKL stats */
 633         unsigned int bkl_count;
 634 #endif
 635 };
 636 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 637
 638 #ifdef CONFIG_SCHEDSTATS
 639 extern const struct file_operations proc_schedstat_operations;
 640 #endif /* CONFIG_SCHEDSTATS */
 641
 642 #ifdef CONFIG_TASK_DELAY_ACCT
 643 struct task_delay_info {
 644         spinlock_t      lock;
 645         unsigned int    flags;  /* Private per-task flags */
 646
 647         /* For each stat XXX, add following, aligned appropriately
 648          *
 649          * struct timespec XXX_start, XXX_end;
 650          * u64 XXX_delay;
 651          * u32 XXX_count;
 652          *
 653          * Atomicity of updates to XXX_delay, XXX_count protected by
 654          * single lock above (split into XXX_lock if contention is an issue).
 655          */
 656
 657         /*
 658          * XXX_count is incremented on every XXX operation, the delay
 659          * associated with the operation is added to XXX_delay.
 660          * XXX_delay contains the accumulated delay time in nanoseconds.
 661          */
 662         struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
 663         u64 blkio_delay;        /* wait for sync block io completion */
 664         u64 swapin_delay;       /* wait for swapin block io completion */
 665         u32 blkio_count;        /* total count of the number of sync block */
 666                                 /* io operations performed */
 667         u32 swapin_count;       /* total count of the number of swapin block */
 668                                 /* io operations performed */
 669 };
 670 #endif  /* CONFIG_TASK_DELAY_ACCT */
 671
 672 static inline int sched_info_on(void)
 673 {
 674 #ifdef CONFIG_SCHEDSTATS
 675         return 1;
 676 #elif defined(CONFIG_TASK_DELAY_ACCT)
 677         extern int delayacct_on;
 678         return delayacct_on;
 679 #else
 680         return 0;
 681 #endif
 682 }
 683
 684 enum cpu_idle_type {
 685         CPU_IDLE,
 686         CPU_NOT_IDLE,
 687         CPU_NEWLY_IDLE,
 688         CPU_MAX_IDLE_TYPES
 689 };
 690
 691 /*
 692  * sched-domains (multiprocessor balancing) declarations:
 693  */
 694
 695 /*
 696  * Increase resolution of nice-level calculations:
 697  */
 698 #define SCHED_LOAD_SHIFT        10
 699 #define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 700
 701 #define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 702
 703 #ifdef CONFIG_SMP
 704 #define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */
 705 #define SD_BALANCE_NEWIDLE      2       /* Balance when about to become idle */
 706 #define SD_BALANCE_EXEC         4       /* Balance on exec */
 707 #define SD_BALANCE_FORK         8       /* Balance on fork, clone */
 708 #define SD_WAKE_IDLE            16      /* Wake to idle CPU on task wakeup */
 709 #define SD_WAKE_AFFINE          32      /* Wake task to waking CPU */
 710 #define SD_WAKE_BALANCE         64      /* Perform balancing at task wakeup */
 711 #define SD_SHARE_CPUPOWER       128     /* Domain members share cpu power */
 712 #define SD_POWERSAVINGS_BALANCE 256     /* Balance for power savings */
 713 #define SD_SHARE_PKG_RESOURCES  512     /* Domain members share cpu pkg resources */
 714 #define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 715 #define SD_WAKE_IDLE_FAR        2048    /* Gain latency sacrificing cache hit */
 716
 717 #define BALANCE_FOR_MC_POWER    \
 718         (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
 719
 720 #define BALANCE_FOR_PKG_POWER   \
 721         ((sched_mc_power_savings || sched_smt_power_savings) ?  \
 722          SD_POWERSAVINGS_BALANCE : 0)
 723
 724 #define test_sd_parent(sd, flag)        ((sd->parent &&         \
 725                                          (sd->parent->flags & flag)) ? 1 : 0)
 726
 727
 728 struct sched_group {
 729         struct sched_group *next;       /* Must be a circular list */
 730         cpumask_t cpumask;
 731
 732         /*
 733          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
 734          * single CPU. This is read only (except for setup, hotplug CPU).
 735          * Note : Never change cpu_power without recompute its reciprocal
 736          */
 737         unsigned int __cpu_power;
 738         /*
 739          * reciprocal value of cpu_power to avoid expensive divides
 740          * (see include/linux/reciprocal_div.h)
 741          */
 742         u32 reciprocal_cpu_power;
 743 };
 744
 745 enum sched_domain_level {
 746         SD_LV_NONE = 0,
 747         SD_LV_SIBLING,
 748         SD_LV_MC,
 749         SD_LV_CPU,
 750         SD_LV_NODE,
 751         SD_LV_ALLNODES,
 752         SD_LV_MAX
 753 };
 754
 755 struct sched_domain_attr {
 756         int relax_domain_level;
 757 };
 758
 759 #define SD_ATTR_INIT    (struct sched_domain_attr) {    \
 760         .relax_domain_level = -1,                       \
 761 }
 762
 763 struct sched_domain {
 764         /* These fields must be setup */
 765         struct sched_domain *parent;    /* top domain must be null terminated */
 766         struct sched_domain *child;     /* bottom domain must be null terminated */
 767         struct sched_group *groups;     /* the balancing groups of the domain */
 768         cpumask_t span;                 /* span of all CPUs in this domain */
 769         unsigned long min_interval;     /* Minimum balance interval ms */
 770         unsigned long max_interval;     /* Maximum balance interval ms */
 771         unsigned int busy_factor;       /* less balancing by factor if busy */
 772         unsigned int imbalance_pct;     /* No balance until over watermark */
 773         unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
 774         unsigned int busy_idx;
 775         unsigned int idle_idx;
 776         unsigned int newidle_idx;
 777         unsigned int wake_idx;
 778         unsigned int forkexec_idx;
 779         int flags;                      /* See SD_* */
 780         enum sched_domain_level level;
 781
 782         /* Runtime fields. */
 783         unsigned long last_balance;     /* init to jiffies. units in jiffies */
 784         unsigned int balance_interval;  /* initialise to 1. units in ms. */
 785         unsigned int nr_balance_failed; /* initialise to 0 */
 786
 787 #ifdef CONFIG_SCHEDSTATS
 788         /* load_balance() stats */
 789         unsigned int lb_count[CPU_MAX_IDLE_TYPES];
 790         unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
 791         unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
 792         unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
 793         unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
 794         unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
 795         unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
 796         unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 797
 798         /* Active load balancing */
 799         unsigned int alb_count;
 800         unsigned int alb_failed;
 801         unsigned int alb_pushed;
 802
 803         /* SD_BALANCE_EXEC stats */
 804         unsigned int sbe_count;
 805         unsigned int sbe_balanced;
 806         unsigned int sbe_pushed;
 807
 808         /* SD_BALANCE_FORK stats */
 809         unsigned int sbf_count;
 810         unsigned int sbf_balanced;
 811         unsigned int sbf_pushed;
 812
 813         /* try_to_wake_up() stats */
 814         unsigned int ttwu_wake_remote;
 815         unsigned int ttwu_move_affine;
 816         unsigned int ttwu_move_balance;
 817 #endif
 818 };
 819
 820 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 821                                     struct sched_domain_attr *dattr_new);
 822 extern int arch_reinit_sched_domains(void);
 823
 824 #endif  /* CONFIG_SMP */
 825
 826 /*
 827  * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
 828  * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
 829  * task of nice 0 or enough lower priority tasks to bring up the
 830  * weighted_cpuload
 831  */
 832 static inline int above_background_load(void)
 833 {
 834         unsigned long cpu;
 835
 836         for_each_online_cpu(cpu) {
 837                 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
 838                         return 1;
 839         }
 840         return 0;
 841 }
 842
 843 struct io_context;                      /* See blkdev.h */
 844 #define NGROUPS_SMALL           32
 845 #define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
 846 struct group_info {
 847         int ngroups;
 848         atomic_t usage;
 849         gid_t small_block[NGROUPS_SMALL];
 850         int nblocks;
 851         gid_t *blocks[0];
 852 };
 853
 854 /*
 855  * get_group_info() must be called with the owning task locked (via task_lock())
 856  * when task != current.  The reason being that the vast majority of callers are
 857  * looking at current->group_info, which can not be changed except by the
 858  * current task.  Changing current->group_info requires the task lock, too.
 859  */
 860 #define get_group_info(group_info) do { \
 861         atomic_inc(&(group_info)->usage); \
 862 } while (0)
 863
 864 #define put_group_info(group_info) do { \
 865         if (atomic_dec_and_test(&(group_info)->usage)) \
 866                 groups_free(group_info); \
 867 } while (0)
 868
 869 extern struct group_info *groups_alloc(int gidsetsize);
 870 extern void groups_free(struct group_info *group_info);
 871 extern int set_current_groups(struct group_info *group_info);
 872 extern int groups_search(struct group_info *group_info, gid_t grp);
 873 /* access the groups "array" with this macro */
 874 #define GROUP_AT(gi, i) \
 875     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 876
 877 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 878 extern void prefetch_stack(struct task_struct *t);
 879 #else
 880 static inline void prefetch_stack(struct task_struct *t) { }
 881 #endif
 882
 883 struct audit_context;           /* See audit.c */
 884 struct mempolicy;
 885 struct pipe_inode_info;
 886 struct uts_namespace;
 887
 888 struct rq;
 889 struct sched_domain;
 890
 891 struct sched_class {
 892         const struct sched_class *next;
 893
 894         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
 895         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
 896         void (*yield_task) (struct rq *rq);
 897         int  (*select_task_rq)(struct task_struct *p, int sync);
 898
 899         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
 900
 901         struct task_struct * (*pick_next_task) (struct rq *rq);
 902         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 903
 904 #ifdef CONFIG_SMP
 905         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
 906                         struct rq *busiest, unsigned long max_load_move,
 907                         struct sched_domain *sd, enum cpu_idle_type idle,
 908                         int *all_pinned, int *this_best_prio);
 909
 910         int (*move_one_task) (struct rq *this_rq, int this_cpu,
 911                               struct rq *busiest, struct sched_domain *sd,
 912                               enum cpu_idle_type idle);
 913         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 914         void (*post_schedule) (struct rq *this_rq);
 915         void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
 916 #endif
 917
 918         void (*set_curr_task) (struct rq *rq);
 919         void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
 920         void (*task_new) (struct rq *rq, struct task_struct *p);
 921         void (*set_cpus_allowed)(struct task_struct *p,
 922                                  const cpumask_t *newmask);
 923
 924         void (*join_domain)(struct rq *rq);
 925         void (*leave_domain)(struct rq *rq);
 926
 927         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
 928                                int running);
 929         void (*switched_to) (struct rq *this_rq, struct task_struct *task,
 930                              int running);
 931         void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
 932                              int oldprio, int running);
 933
 934 #ifdef CONFIG_FAIR_GROUP_SCHED
 935         void (*moved_group) (struct task_struct *p);
 936 #endif
 937 };
 938
 939 struct load_weight {
 940         unsigned long weight, inv_weight;
 941 };
 942
 943 /*
 944  * CFS stats for a schedulable entity (task, task-group etc)
 945  *
 946  * Current field usage histogram:
 947  *
 948  *     4 se->block_start
 949  *     4 se->run_node
 950  *     4 se->sleep_start
 951  *     6 se->load.weight
 952  */
 953 struct sched_entity {
 954         struct load_weight      load;           /* for load-balancing */
 955         struct rb_node          run_node;
 956         struct list_head        group_node;
 957         unsigned int            on_rq;
 958
 959         u64                     exec_start;
 960         u64                     sum_exec_runtime;
 961         u64                     vruntime;
 962         u64                     prev_sum_exec_runtime;
 963
 964         u64                     last_wakeup;
 965         u64                     avg_overlap;
 966
 967 #ifdef CONFIG_SCHEDSTATS
 968         u64                     wait_start;
 969         u64                     wait_max;
 970         u64                     wait_count;
 971         u64                     wait_sum;
 972
 973         u64                     sleep_start;
 974         u64                     sleep_max;
 975         s64                     sum_sleep_runtime;
 976
 977         u64                     block_start;
 978         u64                     block_max;
 979         u64                     exec_max;
 980         u64                     slice_max;
 981
 982         u64                     nr_migrations;
 983         u64                     nr_migrations_cold;
 984         u64                     nr_failed_migrations_affine;
 985         u64                     nr_failed_migrations_running;
 986         u64                     nr_failed_migrations_hot;
 987         u64                     nr_forced_migrations;
 988         u64                     nr_forced2_migrations;
 989
 990         u64                     nr_wakeups;
 991         u64                     nr_wakeups_sync;
 992         u64                     nr_wakeups_migrate;
 993         u64                     nr_wakeups_local;
 994         u64                     nr_wakeups_remote;
 995         u64                     nr_wakeups_affine;
 996         u64                     nr_wakeups_affine_attempts;
 997         u64                     nr_wakeups_passive;
 998         u64                     nr_wakeups_idle;
 999 #endif
1000
1001 #ifdef CONFIG_FAIR_GROUP_SCHED
1002         struct sched_entity     *parent;
1003         /* rq on which this entity is (to be) queued: */
1004         struct cfs_rq           *cfs_rq;
1005         /* rq "owned" by this entity/group: */
1006         struct cfs_rq           *my_q;
1007 #endif
1008 };
1009
1010 struct sched_rt_entity {
1011         struct list_head run_list;
1012         unsigned int time_slice;
1013         unsigned long timeout;
1014         int nr_cpus_allowed;
1015
1016         struct sched_rt_entity *back;
1017 #ifdef CONFIG_RT_GROUP_SCHED
1018         struct sched_rt_entity  *parent;
1019         /* rq on which this entity is (to be) queued: */
1020         struct rt_rq            *rt_rq;
1021         /* rq "owned" by this entity/group: */
1022         struct rt_rq            *my_q;
1023 #endif
1024 };
1025
1026 struct task_struct {
1027         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
1028         void *stack;
1029         atomic_t usage;
1030         unsigned int flags;     /* per process flags, defined below */
1031         unsigned int ptrace;
1032
1033         int lock_depth;         /* BKL lock depth */
1034
1035 #ifdef CONFIG_SMP
1036 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1037         int oncpu;
1038 #endif
1039 #endif
1040
1041         int prio, static_prio, normal_prio;
1042         const struct sched_class *sched_class;
1043         struct sched_entity se;
1044         struct sched_rt_entity rt;
1045
1046 #ifdef CONFIG_PREEMPT_NOTIFIERS
1047         /* list of struct preempt_notifier: */
1048         struct hlist_head preempt_notifiers;
1049 #endif
1050
1051         /*
1052          * fpu_counter contains the number of consecutive context switches
1053          * that the FPU is used. If this is over a threshold, the lazy fpu
1054          * saving becomes unlazy to save the trap. This is an unsigned char
1055          * so that after 256 times the counter wraps and the behavior turns
1056          * lazy again; this to deal with bursty apps that only use FPU for
1057          * a short time
1058          */
1059         unsigned char fpu_counter;
1060         s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1061 #ifdef CONFIG_BLK_DEV_IO_TRACE
1062         unsigned int btrace_seq;
1063 #endif
1064
1065         unsigned int policy;
1066         cpumask_t cpus_allowed;
1067
1068 #ifdef CONFIG_PREEMPT_RCU
1069         int rcu_read_lock_nesting;
1070         int rcu_flipctr_idx;
1071 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1072
1073 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1074         struct sched_info sched_info;
1075 #endif
1076
1077         struct list_head tasks;
1078         /*
1079          * ptrace_list/ptrace_children forms the list of my children
1080          * that were stolen by a ptracer.
1081          */
1082         struct list_head ptrace_children;
1083         struct list_head ptrace_list;
1084
1085         struct mm_struct *mm, *active_mm;
1086
1087 /* task state */
1088         struct linux_binfmt *binfmt;
1089         int exit_state;
1090         int exit_code, exit_signal;
1091         int pdeath_signal;  /*  The signal sent when the parent dies  */
1092         /* ??? */
1093         unsigned int personality;
1094         unsigned did_exec:1;
1095         pid_t pid;
1096         pid_t tgid;
1097
1098 #ifdef CONFIG_CC_STACKPROTECTOR
1099         /* Canary value for the -fstack-protector gcc feature */
1100         unsigned long stack_canary;
1101 #endif
1102         /*
1103          * pointers to (original) parent process, youngest child, younger sibling,
1104          * older sibling, respectively.  (p->father can be replaced with
1105          * p->parent->pid)
1106          */
1107         struct task_struct *real_parent; /* real parent process (when being debugged) */
1108         struct task_struct *parent;     /* parent process */
1109         /*
1110          * children/sibling forms the list of my children plus the
1111          * tasks I'm ptracing.
1112          */
1113         struct list_head children;      /* list of my children */
1114         struct list_head sibling;       /* linkage in my parent's children list */
1115         struct task_struct *group_leader;       /* threadgroup leader */
1116
1117         /* PID/PID hash table linkage. */
1118         struct pid_link pids[PIDTYPE_MAX];
1119         struct list_head thread_group;
1120
1121         struct completion *vfork_done;          /* for vfork() */
1122         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1123         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1124
1125         unsigned int rt_priority;
1126         cputime_t utime, stime, utimescaled, stimescaled;
1127         cputime_t gtime;
1128         cputime_t prev_utime, prev_stime;
1129         unsigned long nvcsw, nivcsw; /* context switch counts */
1130         struct timespec start_time;             /* monotonic time */
1131         struct timespec real_start_time;        /* boot based time */
1132 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1133         unsigned long min_flt, maj_flt;
1134
1135         cputime_t it_prof_expires, it_virt_expires;
1136         unsigned long long it_sched_expires;
1137         struct list_head cpu_timers[3];
1138
1139 /* process credentials */
1140         uid_t uid,euid,suid,fsuid;
1141         gid_t gid,egid,sgid,fsgid;
1142         struct group_info *group_info;
1143         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
1144         unsigned securebits;
1145         struct user_struct *user;
1146 #ifdef CONFIG_KEYS
1147         struct key *request_key_auth;   /* assumed request_key authority */
1148         struct key *thread_keyring;     /* keyring private to this thread */
1149         unsigned char jit_keyring;      /* default keyring to attach requested keys to */
1150 #endif
1151         char comm[TASK_COMM_LEN]; /* executable name excluding path
1152                                      - access with [gs]et_task_comm (which lock
1153                                        it with task_lock())
1154                                      - initialized normally by flush_old_exec */
1155 /* file system info */
1156         int link_count, total_link_count;
1157 #ifdef CONFIG_SYSVIPC
1158 /* ipc stuff */
1159         struct sysv_sem sysvsem;
1160 #endif
1161 #ifdef CONFIG_DETECT_SOFTLOCKUP
1162 /* hung task detection */
1163         unsigned long last_switch_timestamp;
1164         unsigned long last_switch_count;
1165 #endif
1166 /* CPU-specific state of this task */
1167         struct thread_struct thread;
1168 /* filesystem information */
1169         struct fs_struct *fs;
1170 /* open file information */
1171         struct files_struct *files;
1172 /* namespaces */
1173         struct nsproxy *nsproxy;
1174 /* signal handlers */
1175         struct signal_struct *signal;
1176         struct sighand_struct *sighand;
1177
1178         sigset_t blocked, real_blocked;
1179         sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1180         struct sigpending pending;
1181
1182         unsigned long sas_ss_sp;
1183         size_t sas_ss_size;
1184         int (*notifier)(void *priv);
1185         void *notifier_data;
1186         sigset_t *notifier_mask;
1187 #ifdef CONFIG_SECURITY
1188         void *security;
1189 #endif
1190         struct audit_context *audit_context;
1191 #ifdef CONFIG_AUDITSYSCALL
1192         uid_t loginuid;
1193         unsigned int sessionid;
1194 #endif
1195         seccomp_t seccomp;
1196
1197 /* Thread group tracking */
1198         u32 parent_exec_id;
1199         u32 self_exec_id;
1200 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1201         spinlock_t alloc_lock;
1202
1203         /* Protection of the PI data structures: */
1204         spinlock_t pi_lock;
1205
1206 #ifdef CONFIG_RT_MUTEXES
1207         /* PI waiters blocked on a rt_mutex held by this task */
1208         struct plist_head pi_waiters;
1209         /* Deadlock detection and priority inheritance handling */
1210         struct rt_mutex_waiter *pi_blocked_on;
1211 #endif
1212
1213 #ifdef CONFIG_DEBUG_MUTEXES
1214         /* mutex deadlock detection */
1215         struct mutex_waiter *blocked_on;
1216 #endif
1217 #ifdef CONFIG_TRACE_IRQFLAGS
1218         unsigned int irq_events;
1219         int hardirqs_enabled;
1220         unsigned long hardirq_enable_ip;
1221         unsigned int hardirq_enable_event;
1222         unsigned long hardirq_disable_ip;
1223         unsigned int hardirq_disable_event;
1224         int softirqs_enabled;
1225         unsigned long softirq_disable_ip;
1226         unsigned int softirq_disable_event;
1227         unsigned long softirq_enable_ip;
1228         unsigned int softirq_enable_event;
1229         int hardirq_context;
1230         int softirq_context;
1231 #endif
1232 #ifdef CONFIG_LOCKDEP
1233 # define MAX_LOCK_DEPTH 48UL
1234         u64 curr_chain_key;
1235         int lockdep_depth;
1236         struct held_lock held_locks[MAX_LOCK_DEPTH];
1237         unsigned int lockdep_recursion;
1238 #endif
1239
1240 /* journalling filesystem info */
1241         void *journal_info;
1242
1243 /* stacked block device info */
1244         struct bio *bio_list, **bio_tail;
1245
1246 /* VM state */
1247         struct reclaim_state *reclaim_state;
1248
1249         struct backing_dev_info *backing_dev_info;
1250
1251         struct io_context *io_context;
1252
1253         unsigned long ptrace_message;
1254         siginfo_t *last_siginfo; /* For ptrace use.  */
1255 #ifdef CONFIG_TASK_XACCT
1256 /* i/o counters(bytes read/written, #syscalls */
1257         u64 rchar, wchar, syscr, syscw;
1258 #endif
1259         struct task_io_accounting ioac;
1260 #if defined(CONFIG_TASK_XACCT)
1261         u64 acct_rss_mem1;      /* accumulated rss usage */
1262         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1263         cputime_t acct_stimexpd;/* stime since last update */
1264 #endif
1265 #ifdef CONFIG_NUMA
1266         struct mempolicy *mempolicy;
1267         short il_next;
1268 #endif
1269 #ifdef CONFIG_CPUSETS
1270         nodemask_t mems_allowed;
1271         int cpuset_mems_generation;
1272         int cpuset_mem_spread_rotor;
1273 #endif
1274 #ifdef CONFIG_CGROUPS
1275         /* Control Group info protected by css_set_lock */
1276         struct css_set *cgroups;
1277         /* cg_list protected by css_set_lock and tsk->alloc_lock */
1278         struct list_head cg_list;
1279 #endif
1280 #ifdef CONFIG_FUTEX
1281         struct robust_list_head __user *robust_list;
1282 #ifdef CONFIG_COMPAT
1283         struct compat_robust_list_head __user *compat_robust_list;
1284 #endif
1285         struct list_head pi_state_list;
1286         struct futex_pi_state *pi_state_cache;
1287 #endif
1288         atomic_t fs_excl;       /* holding fs exclusive resources */
1289         struct rcu_head rcu;
1290
1291         /*
1292          * cache last used pipe for splice
1293          */
1294         struct pipe_inode_info *splice_pipe;
1295 #ifdef  CONFIG_TASK_DELAY_ACCT
1296         struct task_delay_info *delays;
1297 #endif
1298 #ifdef CONFIG_FAULT_INJECTION
1299         int make_it_fail;
1300 #endif
1301         struct prop_local_single dirties;
1302 #ifdef CONFIG_LATENCYTOP
1303         int latency_record_count;
1304         struct latency_record latency_record[LT_SAVECOUNT];
1305 #endif
1306 };
1307
1308 /*
1309  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1310  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1311  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1312  * values are inverted: lower p->prio value means higher priority.
1313  *
1314  * The MAX_USER_RT_PRIO value allows the actual maximum
1315  * RT priority to be separate from the value exported to
1316  * user-space.  This allows kernel threads to set their
1317  * priority to a value higher than any user task. Note:
1318  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1319  */
1320
1321 #define MAX_USER_RT_PRIO        100
1322 #define MAX_RT_PRIO             MAX_USER_RT_PRIO
1323
1324 #define MAX_PRIO                (MAX_RT_PRIO + 40)
1325 #define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1326
1327 static inline int rt_prio(int prio)
1328 {
1329         if (unlikely(prio < MAX_RT_PRIO))
1330                 return 1;
1331         return 0;
1332 }
1333
1334 static inline int rt_task(struct task_struct *p)
1335 {
1336         return rt_prio(p->prio);
1337 }
1338
1339 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1340 {
1341         tsk->signal->__session = session;
1342 }
1343
1344 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1345 {
1346         tsk->signal->__pgrp = pgrp;
1347 }
1348
1349 static inline struct pid *task_pid(struct task_struct *task)
1350 {
1351         return task->pids[PIDTYPE_PID].pid;
1352 }
1353
1354 static inline struct pid *task_tgid(struct task_struct *task)
1355 {
1356         return task->group_leader->pids[PIDTYPE_PID].pid;
1357 }
1358
1359 static inline struct pid *task_pgrp(struct task_struct *task)
1360 {
1361         return task->group_leader->pids[PIDTYPE_PGID].pid;
1362 }
1363
1364 static inline struct pid *task_session(struct task_struct *task)
1365 {
1366         return task->group_leader->pids[PIDTYPE_SID].pid;
1367 }
1368
1369 struct pid_namespace;
1370
1371 /*
1372  * the helpers to get the task's different pids as they are seen
1373  * from various namespaces
1374  *
1375  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1376  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1377  *                     current.
1378  * task_xid_nr_ns()  : id seen from the ns specified;
1379  *
1380  * set_task_vxid()   : assigns a virtual id to a task;
1381  *
1382  * see also pid_nr() etc in include/linux/pid.h
1383  */
1384
1385 static inline pid_t task_pid_nr(struct task_struct *tsk)
1386 {
1387         return tsk->pid;
1388 }
1389
1390 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1391
1392 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1393 {
1394         return pid_vnr(task_pid(tsk));
1395 }
1396
1397
1398 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1399 {
1400         return tsk->tgid;
1401 }
1402
1403 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1404
1405 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1406 {
1407         return pid_vnr(task_tgid(tsk));
1408 }
1409
1410
1411 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1412 {
1413         return tsk->signal->__pgrp;
1414 }
1415
1416 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1417
1418 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1419 {
1420         return pid_vnr(task_pgrp(tsk));
1421 }
1422
1423
1424 static inline pid_t task_session_nr(struct task_struct *tsk)
1425 {
1426         return tsk->signal->__session;
1427 }
1428
1429 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1430
1431 static inline pid_t task_session_vnr(struct task_struct *tsk)
1432 {
1433         return pid_vnr(task_session(tsk));
1434 }
1435
1436
1437 /**
1438  * pid_alive - check that a task structure is not stale
1439  * @p: Task structure to be checked.
1440  *
1441  * Test if a process is not yet dead (at most zombie state)
1442  * If pid_alive fails, then pointers within the task structure
1443  * can be stale and must not be dereferenced.
1444  */
1445 static inline int pid_alive(struct task_struct *p)
1446 {
1447         return p->pids[PIDTYPE_PID].pid != NULL;
1448 }
1449
1450 /**
1451  * is_global_init - check if a task structure is init
1452  * @tsk: Task structure to be checked.
1453  *
1454  * Check if a task structure is the first user space task the kernel created.
1455  */
1456 static inline int is_global_init(struct task_struct *tsk)
1457 {
1458         return tsk->pid == 1;
1459 }
1460
1461 /*
1462  * is_container_init:
1463  * check whether in the task is init in its own pid namespace.
1464  */
1465 extern int is_container_init(struct task_struct *tsk);
1466
1467 extern struct pid *cad_pid;
1468
1469 extern void free_task(struct task_struct *tsk);
1470 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1471
1472 extern void __put_task_struct(struct task_struct *t);
1473
1474 static inline void put_task_struct(struct task_struct *t)
1475 {
1476         if (atomic_dec_and_test(&t->usage))
1477                 __put_task_struct(t);
1478 }
1479
1480 /*
1481  * Per process flags
1482  */
1483 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
1484                                         /* Not implemented yet, only for 486*/
1485 #define PF_STARTING     0x00000002      /* being created */
1486 #define PF_EXITING      0x00000004      /* getting shut down */
1487 #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1488 #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1489 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1490 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1491 #define PF_DUMPCORE     0x00000200      /* dumped core */
1492 #define PF_SIGNALED     0x00000400      /* killed by a signal */
1493 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
1494 #define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
1495 #define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1496 #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1497 #define PF_FROZEN       0x00010000      /* frozen for system suspend */
1498 #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1499 #define PF_KSWAPD       0x00040000      /* I am kswapd */
1500 #define PF_SWAPOFF      0x00080000      /* I am in swapoff */
1501 #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1502 #define PF_BORROWED_MM  0x00200000      /* I am a kthread doing use_mm */
1503 #define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1504 #define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1505 #define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1506 #define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1507 #define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1508 #define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1509 #define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
1510
1511 /*
1512  * Only the _current_ task can read/write to tsk->flags, but other
1513  * tasks can access tsk->flags in readonly mode for example
1514  * with tsk_used_math (like during threaded core dumping).
1515  * There is however an exception to this rule during ptrace
1516  * or during fork: the ptracer task is allowed to write to the
1517  * child->flags of its traced child (same goes for fork, the parent
1518  * can write to the child->flags), because we're guaranteed the
1519  * child is not running and in turn not changing child->flags
1520  * at the same time the parent does it.
1521  */
1522 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1523 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1524 #define clear_used_math() clear_stopped_child_used_math(current)
1525 #define set_used_math() set_stopped_child_used_math(current)
1526 #define conditional_stopped_child_used_math(condition, child) \
1527         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1528 #define conditional_used_math(condition) \
1529         conditional_stopped_child_used_math(condition, current)
1530 #define copy_to_stopped_child_used_math(child) \
1531         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1532 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1533 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1534 #define used_math() tsk_used_math(current)
1535
1536 #ifdef CONFIG_SMP
1537 extern int set_cpus_allowed_ptr(struct task_struct *p,
1538                                 const cpumask_t *new_mask);
1539 #else
1540 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1541                                        const cpumask_t *new_mask)
1542 {
1543         if (!cpu_isset(0, *new_mask))
1544                 return -EINVAL;
1545         return 0;
1546 }
1547 #endif
1548 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1549 {
1550         return set_cpus_allowed_ptr(p, &new_mask);
1551 }
1552
1553 extern unsigned long long sched_clock(void);
1554
1555 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1556 static inline void sched_clock_init(void)
1557 {
1558 }
1559
1560 static inline u64 sched_clock_cpu(int cpu)
1561 {
1562         return sched_clock();
1563 }
1564
1565 static inline void sched_clock_tick(void)
1566 {
1567 }
1568
1569 static inline void sched_clock_idle_sleep_event(void)
1570 {
1571 }
1572
1573 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1574 {
1575 }
1576 #else
1577 extern void sched_clock_init(void);
1578 extern u64 sched_clock_cpu(int cpu);
1579 extern void sched_clock_tick(void);
1580 extern void sched_clock_idle_sleep_event(void);
1581 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1582 #endif
1583
1584 /*
1585  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1586  * clock constructed from sched_clock():
1587  */
1588 extern unsigned long long cpu_clock(int cpu);
1589
1590 extern unsigned long long
1591 task_sched_runtime(struct task_struct *task);
1592
1593 /* sched_exec is called by processes performing an exec */
1594 #ifdef CONFIG_SMP
1595 extern void sched_exec(void);
1596 #else
1597 #define sched_exec()   {}
1598 #endif
1599
1600 extern void sched_clock_idle_sleep_event(void);
1601 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1602
1603 #ifdef CONFIG_HOTPLUG_CPU
1604 extern void idle_task_exit(void);
1605 #else
1606 static inline void idle_task_exit(void) {}
1607 #endif
1608
1609 extern void sched_idle_next(void);
1610
1611 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1612 extern void wake_up_idle_cpu(int cpu);
1613 #else
1614 static inline void wake_up_idle_cpu(int cpu) { }
1615 #endif
1616
1617 #ifdef CONFIG_SCHED_DEBUG
1618 extern unsigned int sysctl_sched_latency;
1619 extern unsigned int sysctl_sched_min_granularity;
1620 extern unsigned int sysctl_sched_wakeup_granularity;
1621 extern unsigned int sysctl_sched_child_runs_first;
1622 extern unsigned int sysctl_sched_features;
1623 extern unsigned int sysctl_sched_migration_cost;
1624 extern unsigned int sysctl_sched_nr_migrate;
1625
1626 int sched_nr_latency_handler(struct ctl_table *table, int write,
1627                 struct file *file, void __user *buffer, size_t *length,
1628                 loff_t *ppos);
1629 #endif
1630 extern unsigned int sysctl_sched_rt_period;
1631 extern int sysctl_sched_rt_runtime;
1632
1633 int sched_rt_handler(struct ctl_table *table, int write,
1634                 struct file *filp, void __user *buffer, size_t *lenp,
1635                 loff_t *ppos);
1636
1637 extern unsigned int sysctl_sched_compat_yield;
1638
1639 #ifdef CONFIG_RT_MUTEXES
1640 extern int rt_mutex_getprio(struct task_struct *p);
1641 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1642 extern void rt_mutex_adjust_pi(struct task_struct *p);
1643 #else
1644 static inline int rt_mutex_getprio(struct task_struct *p)
1645 {
1646         return p->normal_prio;
1647 }
1648 # define rt_mutex_adjust_pi(p)          do { } while (0)
1649 #endif
1650
1651 extern void set_user_nice(struct task_struct *p, long nice);
1652 extern int task_prio(const struct task_struct *p);
1653 extern int task_nice(const struct task_struct *p);
1654 extern int can_nice(const struct task_struct *p, const int nice);
1655 extern int task_curr(const struct task_struct *p);
1656 extern int idle_cpu(int cpu);
1657 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1658 extern struct task_struct *idle_task(int cpu);
1659 extern struct task_struct *curr_task(int cpu);
1660 extern void set_curr_task(int cpu, struct task_struct *p);
1661
1662 void yield(void);
1663
1664 /*
1665  * The default (Linux) execution domain.
1666  */
1667 extern struct exec_domain       default_exec_domain;
1668
1669 union thread_union {
1670         struct thread_info thread_info;
1671         unsigned long stack[THREAD_SIZE/sizeof(long)];
1672 };
1673
1674 #ifndef __HAVE_ARCH_KSTACK_END
1675 static inline int kstack_end(void *addr)
1676 {
1677         /* Reliable end of stack detection:
1678          * Some APM bios versions misalign the stack
1679          */
1680         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1681 }
1682 #endif
1683
1684 extern union thread_union init_thread_union;
1685 extern struct task_struct init_task;
1686
1687 extern struct   mm_struct init_mm;
1688
1689 extern struct pid_namespace init_pid_ns;
1690
1691 /*
1692  * find a task by one of its numerical ids
1693  *
1694  * find_task_by_pid_type_ns():
1695  *      it is the most generic call - it finds a task by all id,
1696  *      type and namespace specified
1697  * find_task_by_pid_ns():
1698  *      finds a task by its pid in the specified namespace
1699  * find_task_by_vpid():
1700  *      finds a task by its virtual pid
1701  * find_task_by_pid():
1702  *      finds a task by its global pid
1703  *
1704  * see also find_pid() etc in include/linux/pid.h
1705  */
1706
1707 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1708                 struct pid_namespace *ns);
1709
1710 static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr)
1711 {
1712         return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
1713 }
1714 extern struct task_struct *find_task_by_vpid(pid_t nr);
1715 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1716                 struct pid_namespace *ns);
1717
1718 extern void __set_special_pids(struct pid *pid);
1719
1720 /* per-UID process charging. */
1721 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1722 static inline struct user_struct *get_uid(struct user_struct *u)
1723 {
1724         atomic_inc(&u->__count);
1725         return u;
1726 }
1727 extern void free_uid(struct user_struct *);
1728 extern void switch_uid(struct user_struct *);
1729 extern void release_uids(struct user_namespace *ns);
1730
1731 #include <asm/current.h>
1732
1733 extern void do_timer(unsigned long ticks);
1734
1735 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1736 extern int wake_up_process(struct task_struct *tsk);
1737 extern void wake_up_new_task(struct task_struct *tsk,
1738                                 unsigned long clone_flags);
1739 #ifdef CONFIG_SMP
1740  extern void kick_process(struct task_struct *tsk);
1741 #else
1742  static inline void kick_process(struct task_struct *tsk) { }
1743 #endif
1744 extern void sched_fork(struct task_struct *p, int clone_flags);
1745 extern void sched_dead(struct task_struct *p);
1746
1747 extern int in_group_p(gid_t);
1748 extern int in_egroup_p(gid_t);
1749
1750 extern void proc_caches_init(void);
1751 extern void flush_signals(struct task_struct *);
1752 extern void ignore_signals(struct task_struct *);
1753 extern void flush_signal_handlers(struct task_struct *, int force_default);
1754 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1755
1756 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1757 {
1758         unsigned long flags;
1759         int ret;
1760
1761         spin_lock_irqsave(&tsk->sighand->siglock, flags);
1762         ret = dequeue_signal(tsk, mask, info);
1763         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1764
1765         return ret;
1766 }
1767
1768 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1769                               sigset_t *mask);
1770 extern void unblock_all_signals(void);
1771 extern void release_task(struct task_struct * p);
1772 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1773 extern int force_sigsegv(int, struct task_struct *);
1774 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1775 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1776 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1777 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1778 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1779 extern int kill_pid(struct pid *pid, int sig, int priv);
1780 extern int kill_proc_info(int, struct siginfo *, pid_t);
1781 extern void do_notify_parent(struct task_struct *, int);
1782 extern void force_sig(int, struct task_struct *);
1783 extern void force_sig_specific(int, struct task_struct *);
1784 extern int send_sig(int, struct task_struct *, int);
1785 extern void zap_other_threads(struct task_struct *p);
1786 extern int kill_proc(pid_t, int, int);
1787 extern struct sigqueue *sigqueue_alloc(void);
1788 extern void sigqueue_free(struct sigqueue *);
1789 extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
1790 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1791 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1792
1793 static inline int kill_cad_pid(int sig, int priv)
1794 {
1795         return kill_pid(cad_pid, sig, priv);
1796 }
1797
1798 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
1799 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1800 #define SEND_SIG_PRIV   ((struct siginfo *) 1)
1801 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1802
1803 static inline int is_si_special(const struct siginfo *info)
1804 {
1805         return info <= SEND_SIG_FORCED;
1806 }
1807
1808 /* True if we are on the alternate signal stack.  */
1809
1810 static inline int on_sig_stack(unsigned long sp)
1811 {
1812         return (sp - current->sas_ss_sp < current->sas_ss_size);
1813 }
1814
1815 static inline int sas_ss_flags(unsigned long sp)
1816 {
1817         return (current->sas_ss_size == 0 ? SS_DISABLE
1818                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1819 }
1820
1821 /*
1822  * Routines for handling mm_structs
1823  */
1824 extern struct mm_struct * mm_alloc(void);
1825
1826 /* mmdrop drops the mm and the page tables */
1827 extern void __mmdrop(struct mm_struct *);
1828 static inline void mmdrop(struct mm_struct * mm)
1829 {
1830         if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1831                 __mmdrop(mm);
1832 }
1833
1834 /* mmput gets rid of the mappings and all user-space */
1835 extern void mmput(struct mm_struct *);
1836 /* Grab a reference to a task's mm, if it is not already going away */
1837 extern struct mm_struct *get_task_mm(struct task_struct *task);
1838 /* Remove the current tasks stale references to the old mm_struct */
1839 extern void mm_release(struct task_struct *, struct mm_struct *);
1840 /* Allocate a new mm structure and copy contents from tsk->mm */
1841 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1842
1843 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1844 extern void flush_thread(void);
1845 extern void exit_thread(void);
1846
1847 extern void exit_files(struct task_struct *);
1848 extern void __cleanup_signal(struct signal_struct *);
1849 extern void __cleanup_sighand(struct sighand_struct *);
1850
1851 extern void exit_itimers(struct signal_struct *);
1852 extern void flush_itimer_signals(void);
1853
1854 extern NORET_TYPE void do_group_exit(int);
1855
1856 extern void daemonize(const char *, ...);
1857 extern int allow_signal(int);
1858 extern int disallow_signal(int);
1859
1860 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1861 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1862 struct task_struct *fork_idle(int);
1863
1864 extern void set_task_comm(struct task_struct *tsk, char *from);
1865 extern char *get_task_comm(char *to, struct task_struct *tsk);
1866
1867 #ifdef CONFIG_SMP
1868 extern void wait_task_inactive(struct task_struct * p);
1869 #else
1870 #define wait_task_inactive(p)   do { } while (0)
1871 #endif
1872
1873 #define remove_parent(p)        list_del_init(&(p)->sibling)
1874 #define add_parent(p)           list_add_tail(&(p)->sibling,&(p)->parent->children)
1875
1876 #define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1877
1878 #define for_each_process(p) \
1879         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1880
1881 /*
1882  * Careful: do_each_thread/while_each_thread is a double loop so
1883  *          'break' will not work as expected - use goto instead.
1884  */
1885 #define do_each_thread(g, t) \
1886         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1887
1888 #define while_each_thread(g, t) \
1889         while ((t = next_thread(t)) != g)
1890
1891 /* de_thread depends on thread_group_leader not being a pid based check */
1892 #define thread_group_leader(p)  (p == p->group_leader)
1893
1894 /* Do to the insanities of de_thread it is possible for a process
1895  * to have the pid of the thread group leader without actually being
1896  * the thread group leader.  For iteration through the pids in proc
1897  * all we care about is that we have a task with the appropriate
1898  * pid, we don't actually care if we have the right task.
1899  */
1900 static inline int has_group_leader_pid(struct task_struct *p)
1901 {
1902         return p->pid == p->tgid;
1903 }
1904
1905 static inline
1906 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1907 {
1908         return p1->tgid == p2->tgid;
1909 }
1910
1911 static inline struct task_struct *next_thread(const struct task_struct *p)
1912 {
1913         return list_entry(rcu_dereference(p->thread_group.next),
1914                           struct task_struct, thread_group);
1915 }
1916
1917 static inline int thread_group_empty(struct task_struct *p)
1918 {
1919         return list_empty(&p->thread_group);
1920 }
1921
1922 #define delay_group_leader(p) \
1923                 (thread_group_leader(p) && !thread_group_empty(p))
1924
1925 /*
1926  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1927  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
1928  * pins the final release of task.io_context.  Also protects ->cpuset and
1929  * ->cgroup.subsys[].
1930  *
1931  * Nests both inside and outside of read_lock(&tasklist_lock).
1932  * It must not be nested with write_lock_irq(&tasklist_lock),
1933  * neither inside nor outside.
1934  */
1935 static inline void task_lock(struct task_struct *p)
1936 {
1937         spin_lock(&p->alloc_lock);
1938 }
1939
1940 static inline void task_unlock(struct task_struct *p)
1941 {
1942         spin_unlock(&p->alloc_lock);
1943 }
1944
1945 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1946                                                         unsigned long *flags);
1947
1948 static inline void unlock_task_sighand(struct task_struct *tsk,
1949                                                 unsigned long *flags)
1950 {
1951         spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1952 }
1953
1954 #ifndef __HAVE_THREAD_FUNCTIONS
1955
1956 #define task_thread_info(task)  ((struct thread_info *)(task)->stack)
1957 #define task_stack_page(task)   ((task)->stack)
1958
1959 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1960 {
1961         *task_thread_info(p) = *task_thread_info(org);
1962         task_thread_info(p)->task = p;
1963 }
1964
1965 static inline unsigned long *end_of_stack(struct task_struct *p)
1966 {
1967         return (unsigned long *)(task_thread_info(p) + 1);
1968 }
1969
1970 #endif
1971
1972 extern void thread_info_cache_init(void);
1973
1974 /* set thread flags in other task's structures
1975  * - see asm/thread_info.h for TIF_xxxx flags available
1976  */
1977 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1978 {
1979         set_ti_thread_flag(task_thread_info(tsk), flag);
1980 }
1981
1982 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1983 {
1984         clear_ti_thread_flag(task_thread_info(tsk), flag);
1985 }
1986
1987 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1988 {
1989         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1990 }
1991
1992 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1993 {
1994         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1995 }
1996
1997 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1998 {
1999         return test_ti_thread_flag(task_thread_info(tsk), flag);
2000 }
2001
2002 static inline void set_tsk_need_resched(struct task_struct *tsk)
2003 {
2004         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2005 }
2006
2007 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2008 {
2009         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2010 }
2011
2012 static inline int test_tsk_need_resched(struct task_struct *tsk)
2013 {
2014         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2015 }
2016
2017 static inline int signal_pending(struct task_struct *p)
2018 {
2019         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2020 }
2021
2022 extern int __fatal_signal_pending(struct task_struct *p);
2023
2024 static inline int fatal_signal_pending(struct task_struct *p)
2025 {
2026         return signal_pending(p) && __fatal_signal_pending(p);
2027 }
2028
2029 static inline int signal_pending_state(long state, struct task_struct *p)
2030 {
2031         if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2032                 return 0;
2033         if (!signal_pending(p))
2034                 return 0;
2035
2036         if (state & (__TASK_STOPPED | __TASK_TRACED))
2037                 return 0;
2038
2039         return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2040 }
2041
2042 static inline int need_resched(void)
2043 {
2044         return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2045 }
2046
2047 /*
2048  * cond_resched() and cond_resched_lock(): latency reduction via
2049  * explicit rescheduling in places that are safe. The return
2050  * value indicates whether a reschedule was done in fact.
2051  * cond_resched_lock() will drop the spinlock before scheduling,
2052  * cond_resched_softirq() will enable bhs before scheduling.
2053  */
2054 extern int _cond_resched(void);
2055 #ifdef CONFIG_PREEMPT_BKL
2056 static inline int cond_resched(void)
2057 {
2058         return 0;
2059 }
2060 #else
2061 static inline int cond_resched(void)
2062 {
2063         return _cond_resched();
2064 }
2065 #endif
2066 extern int cond_resched_lock(spinlock_t * lock);
2067 extern int cond_resched_softirq(void);
2068 static inline int cond_resched_bkl(void)
2069 {
2070         return _cond_resched();
2071 }
2072
2073 /*
2074  * Does a critical section need to be broken due to another
2075  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2076  * but a general need for low latency)
2077  */
2078 static inline int spin_needbreak(spinlock_t *lock)
2079 {
2080 #ifdef CONFIG_PREEMPT
2081         return spin_is_contended(lock);
2082 #else
2083         return 0;
2084 #endif
2085 }
2086
2087 /*
2088  * Reevaluate whether the task has signals pending delivery.
2089  * Wake the task if so.
2090  * This is required every time the blocked sigset_t changes.
2091  * callers must hold sighand->siglock.
2092  */
2093 extern void recalc_sigpending_and_wake(struct task_struct *t);
2094 extern void recalc_sigpending(void);
2095
2096 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2097
2098 /*
2099  * Wrappers for p->thread_info->cpu access. No-op on UP.
2100  */
2101 #ifdef CONFIG_SMP
2102
2103 static inline unsigned int task_cpu(const struct task_struct *p)
2104 {
2105         return task_thread_info(p)->cpu;
2106 }
2107
2108 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2109
2110 #else
2111
2112 static inline unsigned int task_cpu(const struct task_struct *p)
2113 {
2114         return 0;
2115 }
2116
2117 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2118 {
2119 }
2120
2121 #endif /* CONFIG_SMP */
2122
2123 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2124 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2125 #else
2126 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
2127 {
2128         mm->mmap_base = TASK_UNMAPPED_BASE;
2129         mm->get_unmapped_area = arch_get_unmapped_area;
2130         mm->unmap_area = arch_unmap_area;
2131 }
2132 #endif
2133
2134 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2135 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2136
2137 extern int sched_mc_power_savings, sched_smt_power_savings;
2138
2139 extern void normalize_rt_tasks(void);
2140
2141 #ifdef CONFIG_GROUP_SCHED
2142
2143 extern struct task_group init_task_group;
2144 #ifdef CONFIG_USER_SCHED
2145 extern struct task_group root_task_group;
2146 #endif
2147
2148 extern struct task_group *sched_create_group(struct task_group *parent);
2149 extern void sched_destroy_group(struct task_group *tg);
2150 extern void sched_move_task(struct task_struct *tsk);
2151 #ifdef CONFIG_FAIR_GROUP_SCHED
2152 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2153 extern unsigned long sched_group_shares(struct task_group *tg);
2154 #endif
2155 #ifdef CONFIG_RT_GROUP_SCHED
2156 extern int sched_group_set_rt_runtime(struct task_group *tg,
2157                                       long rt_runtime_us);
2158 extern long sched_group_rt_runtime(struct task_group *tg);
2159 extern int sched_group_set_rt_period(struct task_group *tg,
2160                                       long rt_period_us);
2161 extern long sched_group_rt_period(struct task_group *tg);
2162 #endif
2163 #endif
2164
2165 #ifdef CONFIG_TASK_XACCT
2166 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2167 {
2168         tsk->rchar += amt;
2169 }
2170
2171 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2172 {
2173         tsk->wchar += amt;
2174 }
2175
2176 static inline void inc_syscr(struct task_struct *tsk)
2177 {
2178         tsk->syscr++;
2179 }
2180
2181 static inline void inc_syscw(struct task_struct *tsk)
2182 {
2183         tsk->syscw++;
2184 }
2185 #else
2186 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2187 {
2188 }
2189
2190 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2191 {
2192 }
2193
2194 static inline void inc_syscr(struct task_struct *tsk)
2195 {
2196 }
2197
2198 static inline void inc_syscw(struct task_struct *tsk)
2199 {
2200 }
2201 #endif
2202
2203 #ifdef CONFIG_SMP
2204 void migration_init(void);
2205 #else
2206 static inline void migration_init(void)
2207 {
2208 }
2209 #endif
2210
2211 #ifndef TASK_SIZE_OF
2212 #define TASK_SIZE_OF(tsk)       TASK_SIZE
2213 #endif
2214
2215 #ifdef CONFIG_MM_OWNER
2216 extern void mm_update_next_owner(struct mm_struct *mm);
2217 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2218 #else
2219 static inline void mm_update_next_owner(struct mm_struct *mm)
2220 {
2221 }
2222
2223 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2224 {
2225 }
2226 #endif /* CONFIG_MM_OWNER */
2227
2228 #endif /* __KERNEL__ */
2229
2230 #endif